Here is something that helps you: WikiVS is the the one stop for up-to-date comparisons. Be it a comparison of MySQL vs PostgreSQL, Lighttpd vs Apache or Qt vs GTK. This website has all to help you base your decision on facts.

What are the benefits of such an site for you? The comparison should be up-to-date and you don’t need to look through long threads (some of them flame wars) discussing that topic. At last you can also contribute to the comparisons.

So it’s the open source / community way of doing something like this and I think thats great!